/*
 * Copyright 2020 eBlocker Open Source UG (haftungsbeschraenkt)
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be
 * approved by the European Commission - subsequent versions of the EUPL
 * (the "License"); You may not use this work except in compliance with
 * the License. You may obtain a copy of the License at:
 *
 *   https://joinup.ec.europa.eu/page/eupl-text-11-12
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package org.eblocker.server.common.network;

import org.eblocker.server.common.util.IpUtils;
import com.google.common.base.Splitter;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;

public class DhcpUtils {

    private DhcpUtils() {
    }

    public static List<String> parseDnsServersOption(String option) {
        Splitter splitter = Splitter.on(",").trimResults().omitEmptyStrings();
        return StreamSupport.stream(splitter.split(option).spliterator(), false)
            .filter(IpUtils::isIPAddress)
            .filter(ip -> !"0.0.0.0".equals(ip))
            .collect(Collectors.toList());
    }

}
